After searching for this for a few hours i came across this link from Overland. I didn't have to register, i found it through google.
It states that is a free download so i am sure i am not breaking any copyright by posting here.
A full copy of 4.0.860 - not just the upgrade. Although i did notice that all the file sizes for the upgrade and the full version are exactly the same so it must be a flag set on one of the files that stops you upgrading from 3.x to 4.x using the upgrade.
http://support.overlandstorage.com/j...printable=true
I will try this and post back here with the results.
Cheers